Epidemiology of asthma and associated factors in an urban Pakistani population: adult asthma study-Karachi

BMC Pulmonary Medicine

Table 2 Prevalence of asthma and respiratory symptoms among adults ≥18 years, Karachi, Pakistan, 2015 (n = 1629)

Outcome variables	n (%)	95% CI
Self-reported asthma^a	29 (1.8)	1.0–2.6
Reversibility ≥200 ml in FEV₁^{b d}	105 (11.3)	9.4–13.3
Respiratory symptoms and reversibility ≥200 ml in FEV₁^{C d}	61 (6.6)	5.1–8.1
SOB grade I	410 (25.2)	22.5–27.9
SOB grade II	359 (22.0)	19.5–24.6
Acute cough	72 (4.4)	3.1–5.7
Chronic cough	49 (3.0)	1.9–4.1
Acute wheeze	164 (10.1)	8.2–11.9
Chronic wheeze	130 (8.0)	6.3–9.7
Acute phlegm	107 (6.6)	5.1–8.1
Chronic phlegm	60 (3.7)	2.5–4.9

^dSample size: 930 participants
SOB Shortness of breath
^aSelf-reported, physician-diagnosed asthma
^bSpirometry-based asthma assessed on presence of post-bronchodilator reversibility ≥200 ml in FEV₁
^cAsthma based on post-bronchodilator reversibility ≥200 ml in FEV₁ and one or more respiratory symptoms, or self-reported asthma

ISSN: 1471-2466